- #1
silverwhale
- 84
- 2
Homework Statement
Compute the matrix element for the scattering process [tex] \phi \phi \to \phi \phi [/tex]
Homework Equations
The Lagrangian is given by
[tex] L = \frac{1}{2} \partial_{\mu} \phi \partial^{\mu} \phi + \frac{\alpha}{2} \phi \partial_{\mu} \phi \partial^{\mu} \phi + \frac{\beta}{2} \phi^2 \partial_{\mu} \phi \partial^{\mu} \phi [/tex]
The Attempt at a Solution
At tree level I included a 4 legged vertex diagram + 3 diagrams with an internal line. Is this correct? I get a delta function with 4 momenta ( multiplied with other terms) + product of 2 delta functions with 3 momenta (multiplied with other terms) equal to the scattering implitude multipplied by a delta function of 4 momenta.
Now my question is just what are the Feynman diagrams for the general process: [tex] \phi \phi \to \phi \phi [/tex]